摘要： 利用MUSIC算法进行宽带频谱感知时，主用户信号个数估计是关键问题。为此，提出一种动态门限搜索匹配的信号个数估计算法。利用信号子空间和噪声子空间的正交性动态调整门限，搜索与预设维度最匹配的信号个数作为最终的估计值。仿真结果表明，在低信噪比的情况下，该算法能准确估计信号个数，提高宽带频谱感知性能。
关键词:
宽带频谱感知,
多重集采样,
MUSIC算法,
AIC/MDL准则,
动态门限搜索匹配算法,
认知无线电
Abstract: The estimation of the number of primary user’s signal is a key issue for wideband spectrum sensing method based on MUSIC algorithm. To this end, this paper proposes an algorithm to estimate the number of the signals utilizing search matching algorithm with dynamic threshold. The orthogonal properties of signal subspace and noise subspace is used in this algorithm, which adjusts threshold constantly and searches the signal number that is the best matches with dimensions as the final estimate value. Simulation results show that the proposed algorithm has high accuracy at low Signal Noise Ratio(SNR) which greatly improves the performance of the wideband spectrum sensing.
Key words:
wideband spectrum sensing,
multicoset sampling,
MUSIC algorithm,
AIC/MDL criteria,
search matching algorithm with dynamic threshold,
cognitive radio
中图分类号:
赵知劲, 张鹏, 尚俊娜, 王海泉. 基于MUSIC算法的宽带频谱感知[J]. 计算机工程, 2012, 38(13): 83-85,92.
DIAO Zhi-Jin, ZHANG Feng, CHANG Dun-Na, WANG Hai-Quan. Wideband Spectrum Sensing Based on MUSIC Algorithm[J]. Computer Engineering, 2012, 38(13): 83-85,92.